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Umbra-Devourer

Medium Aberration, Chaotic Evil


Armor Class 15 (natural armor)

Hit Points 64 (8d8+28)

Speed 30 ft.

STR 16 (+3)
DEX 14 (+2)
CON 14 (+2)
INT 10 (+0)
WIS 12 (+1)
CHA 8 (-1)

Saving Throws Con +5, Wis +4

Skills Stealth +6, Perception +4

Damage Resistances necrotic

Condition Immunities charmed, frightened

Senses darkvision 60 ft., passive Perception 14

Languages Common, Undercommon, Abyssal

Challenge 6 (2,300 XP) Proficiency Bonus +3


Shadow Meld. The Umbra-Devourer can blend with shadows. While in dim light or darkness, it has advantage on Stealth checks and can hide as a bonus action.
Abyssal Resilience. The Umbra-Devourer has resistance to necrotic damage.

Actions

Multiattack. The Umbra-Devourer makes two Shadow Claw attacks and one Shadow Tendril attack.
Shadow Claw. Melee weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6+4) necrotic damage. A dark claw rips at the target's flesh, draining light and hope.
Shadow Tendril. Melee weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 7 (1d8+3) necrotic damage. A writhing tendril of shadow seeks to wrap around the foe.

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Lore & Description

Appearance

The Umbra-Devourer is a living abyss that crawls from the shadows itself. It appears as a shifting silhouette of black void, edges curling like smoke, with ember-red motes glinting within its darkness. Its presence dims nearby light, and a chilling silence follows in its wake. When it moves, shadows peel away from walls and floors as if the darkness itself is exhaling and spilling into the world. Its goal is not conquest but consumptionโ€”of light, memory, and the very warmth of lifeโ€”until nothing remains but a whispering void. It speaks in whispers that echo from inside the minds of those it encounters, offering promises it never intends to keep and slowly twisting fear into appetite.

Behavior & Origins

Born from a rift between the Material Plane and the Abyssal void that lies beyond. The Umbra-Devourer does not so much corrupt as it consumes; it feeds on light, on fear, on the will to resist, and on memories that linger in shadows after a battle ends. It crawls along walls and ceilings, using darkness as an ally and a weapon, slipping into places where lanterns burn low and secrets are kept. Adventurers who have faced it describe a creeping dread that seeps into their weapons and thoughts, as if the void itself is trying to swallow their resolve. In cities built near great chasms or caves, the Umbra-Devourer can emerge from a simple shadow left by a torch and begin its slow, inexorable hunger, leaving destruction in its wake as it dissolves light and hope alike.

Generation Info

Original prompt:
"A living abyss that crawls out of shadows."

Created: Feb 2, 2026
Modified: May 22, 2026

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